What is a broadcast storm it?
All devices in the same network in the same broadcast domain. That is, all the broadcast information is broadcast to each port of the network, even if the switches, bridges can not stop the broadcast of information dissemination. So at the same time there can be only one broadcast information is transmitted in the network.
As more and more devices on the network, broadcast time will be occupied by more and more and more to a certain extent, will affect the normal transmission of information on the web, ranging from delays caused by the transmission of information, while resulting in network equipment disconnected from the network, and even cause the entire network congestion, paralysis, which is broadcast storm.
Broadcast Storm causes
By understanding the above network equipment, we can simply analyze it, because the network had broadcast storm. In general, the cause of the network broadcast storms, mainly the following:
1, network equipment reasons: We often have such a misunderstanding, the switch is a point-forward, it will not produce broadcast storms. When we buy network settings, buy switches, usually intelligent Hub, was as profiteers to sell switches. In this way, network a little busy, would certainly produce a broadcast storm.
2, the card is damaged: If the machine network card is damaged, will also broadcast storm. Damage to the card, the switch to stop sending large amounts of data packet, generating a large amount of useless data packet, a broadcast storm is generated. Since the broadcast storm NIC physical damage caused by the failure to exclude more difficult, due to the damage of cards are generally also the Internet, we usually borrow Sniffer local area network management software, view network traffic data to determine the location of the fault.
3, network loop: once in a network troubleshooting, we found a very funny mistake, a twisted pair, both ends plugged into different ports of the same switch, resulting in abrupt decline in network performance, open the page very difficult. This failure, is a typical network loops. Generating network loop, generally due both ends of a line of the physical network, while connected to a single network device.
4, the network virus: Currently, some of the more popular network viruses, Funlove, Sasser, RPC and other viruses, once the machine poisoning, would immediately spread through the network. The spread of network viruses, will be the loss of a large amount of network bandwidth, causing network congestion, cause broadcast storms.
5, using the hacker software: At present, some Internet users, often using the network agents, network Scissorhands and other hacker software, Internet cafes internal network attacks, the use of the software, the network may also cause broadcast storms.
In the event of a fault, the fault should first understand the changes before the network, establish a comprehensive network documentation. A wiring pattern comprising a network, the IP and MAC correspondence table, otherwise determining consumes a lot of time when the MAC address of the port. There are a lot of LAN tools can access this information in a computer network, such as LanExplorer such as by scanning.
